Pneumatic riveter.



' VPATENTED 11 J. KELLER. FEB 1908 PNBUMATIG RIVBTER.

vAPPIJIYOLKTIUI FILED DEU.11. 1900.

4 SHEETS-SHEET 1.

PATENTBD FEB. 11, 1908. 1.1181113811.

-1 NBUMAT1G 111118188.

*"LPPLIUATION FILED DBO.11.1900.

4 SHEETS-SHEET 2.

No. 878,805. PATENTED FEB. 11,1908.

J. KELLER.

PN-EUMATG RIVETER.

APPLICATION FILED DBO.11.1900.

iS *v 4 SHEETS-SHEET 3.

30 nalthough it is evident that other equivalentk UNTTED STATES PATENT oEEIcE.

JULIUs KELLER, oE'rHILAnELPn-IA, rnNnsYINANiA, Assieson, YMEsNE ASSIGNMENTS, `To CHICAGO PNEUMATIc TOOL COMPANY, A cORPORATIoN or NEW JEEsEr.

PNEUMATIC RIVETER.

No; 878,8oi

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed Decemberll, 1900. Serial No. 39.570.

To all whom it may concern: l'

Be it known that I, JULIUs KELLER, a citizen of the United States, residing in the l city and county of Philadelphia, State oil 5 Pennsylvania, have invented a new andusen fnl Improvement in vPnuernatic Riveters, and fr it consists of novel' details of construction,` all as Will be hereinafter Liully' setforth, and particularly pointed out in the claims. i

'10 .Figure 1 represents alongitudinal sectional i view of a pneumatic riveter embodying myA i invention, certain of the parts being shown in 5 elevation and the riveter being shown in connection with a yoke to which the saine is applicable. Fig. 2 represents a longitudinalvertical section of the riveter seen in Fig. 1, on an enlarged scale, [the section being taken on a di'terent axial line, showing I norejespecially the sto valve, stopvalve rod and their. djuncts. ig. 3 represents a section on line Fig. 2.' Fig. 4 represents a section on line y-y Fig. 2. Figs. 5 to 8 represent details.'

`Similar letters ol" reference indicate corresponding parts in the gures.

. eerrng t0 the drawingsz=1 designates a easing connected to the yoke 2 by the clamping piece 3, and held in position by means of the screw bolts 4, and the clamp screw 5,

fastenings may be employed. y 5 designates an outside tool cylinder Wi thin the casing 1, and 7 desi nates the inside tool cylinder which. is force or otherwise in serted into said inst-.mentioned cylinder, ,said inside tool cylinder having the hammer Orpiston 8 adapted to reciprocate therein.

9 designates the valve box, 'within which `reciproates the distributing` valve 1() provided with differential pressure areas, said valve box having thil valve top 1 l., said valve box, valve and top being similar in construction, locationv and operation to the structure protected in Letters Patent No. l5 647,415, granted to me April 10th, l1900, in

`thesaine class of invention and as the operation will be a parent to those skilled in this I art, iahave dieerned a detailed description; thereof yrunnecessary. v te 12 designates a c amping device adapted to hold the valve mechanism tightly against the tool cylinder, although it will be apparent that other suitable means may be employed l :if desired said clamping device being pren l vented from unscrewing'by means of the jam nut 13.

1,4 designates a cup ed shaped Washer of leather or other suita le material, which is held in position against the clam ing device by the washer 15 or other suitab e means, it being evident that the above parts are oontained within the cylinderhead 16, which clolses up the backside or rear end of the cylnu er.

17 designates a throttle valve, having the operating lever- 18, whereby the admlssion ol .the motive. fluid to the riveter is controlled.

19 designates a ring or annulus, which is located betweentheeasing -1 and the outer tool eylinder', said ring being adapted to forni a shoulder andbeing held in posltion by means of the bolts 20 or other suitable tastening devices.

21 designates the 'button set bushing, which is screwed or otherwise secured in the nose end of the outer tool cylinder 6, it being noted that the movable stop valve Washer 22, is located between the inner end of the bushing 21. and the shoulder 23 of the inner 'cylinder 7.

24 designates the button set, which has the recess 25 therein, which'c0-acts with the button set clamp 26, vizlieireb said button set is held to said button set ushing, it be ing seen that said button set has the shank or extension 27, which is freely movable and adapted to 'contact with' the washer 22, as will he .hereafter explained. y

28 designates the 'holder-on which is fastened to the yoke'2 by the clamping screw 2), or other suitable means, said holder-On having'a button set/3() mounted therein.

3l designates astop valve, which is lo cated in a suitable recess 32 in the/valve box l), said stop valve. consisting olE the heads 33 connected by the neck 34, one of said heads being provided with the ste'm 35, which is adapted to contact with the longitudinallyextending stop valve rod 36, Whiehis best seen in Figs. 2 and 5, said sto valve bein held in its forward position lby means o lluid pressure through the porti 37, although it is evident that a spring or other analogous means may be employed Fig: as standing'in its iniddle or upright position, and the en" or fluid pressure enterfor this purpose it desired.. Ithe throttle lever 18 is shown in main exhaust port 48 in the throttle valve,.

and it Will be apparent that the pressure eX- erted against the shoulder 43, will force Athe tool outwardly or a ainst the rivet 49.`

In turning the t rottle valve lever 18 to `the extreme left, as shown in Fig. 3, the ins` let groove 50 of the throttle valve will be connected with the ports 5l, and fluid pressure will pass through the ports 52,53 and 54 into the easing 1, and the pressure being admitted to the distributing valve through the passage 55, the hammer will operate in the usual manner as will be evident to thosel skilled in the art, it bein also apparent that the pressure against the Iiack end of the tool as Well as uion the shoulder 43, will forcel thetool to fo low up the work until the .rivet head is finished. In turning the throttle valve lever `18 back again to the position seen in Fig. 1, the inlet for the compressed air or other motive fluid to the port 54 is closed and as no air enters the distributing valve, the iston or hammer 8 will stop working, but t e tool will remain in the same position against the rivet head as the pressure against the shoulder 43 is continuous.

U on turning the throttle valve lever 18 to t e extreme right as seen in dotted lines in Fig. 3, the port 56 will now be open .for the admission of fluid ressure," which will enter the-pressure cham 45, 46 and 47, and as the pressure area 57 is greater thangthe pressurearea afforded by the shoulder 43, it will be apparent that the Whole tool comprising the outside or outer tool cylinder 6 and its adjuncts will be forced backwardly until it contacts with the head 16, the parts being now in substantially the osition seen in Fi'g.'1.

The distributing valve 10 which I employ Iis constructed insubstantially the same manner as the diitributing valve seen in my prior patent above referred to although 4it will be apparent that in carrying out theA broad idea of my invention, as far as it relates to the principle of moving the tool roper or its cylinder towards and away rom the won. by fluid pressure without startin@r the operation of `the hammer or piston, other be employed without departing from the spirit of my invention.Y As explained in my prior patentthe valve 10 is provided with the flange or small pressure area 58 and also with the larger han e or large pressure area 59,

er 44, through the ports Pports 60, 61,

pressure area 59 of the diiferentlal distr1but.

forms of distributing valves may whereby the ciferential pressurev areas are obtained, and-when the arts are" inthe position seen in Fig. 2, it will. e ap ar,-

ent that the hammer or iston 8hasreac ed' i the extreme y forward en of its stroke,'tlfn1s` opening the port`6``," which connects with the large pressurev area of said valve through the.

ports 61, 62, 63, 64 and 65, the relative positions of these ports being best understood from thel dotted linesbin Fig. 2. The pressure which enters the piston chamber throu h the ports 66 and 67 seen in full lines at t e right of Fi s. 1 and 2, would now be admltted to t `e large pressure area 59 of the valve 10 by the ports 60, 61, 62, 63, 64-and 65, above referred to, and"said valve 10 will be forced forwardly or to the (left of the position seen'in Fig. 5 and live fluid pressure would be conducted through'fthe ports 66,

67 and 68 seen in fulllines in Fig. 1' and in dotted lines in Fig. 2 to the front end of the piston or hammer 8, whereby the latter will move from the position seen'in Fig. 2 into theposition seen in Fig. 1.

I desire to call es ecial attention to another novel feature o my invention whereby provision is made for preventing reciprocation of the hammer 8, unless the button set 24 `is pressed against the rivet, the detailed operation bein@ as follows: I place the recess 32 of the valverbox 9, the stop valve 31 Whose Afunction is tocut off the connection between -the ports 60 and 65', seen dotted in Fig. '2, Y

and it will be apparent that when said stop valve is in the position yseen in Figs. 2 and 7, the port 63 is closed andthe pressure from the piston chamber cannot go through the ports 64 and 65 to the large pressure area 59 of the distributing valve, until the button set 24 is pressed against the work, which will bring the Washer 22, against the shoulder 23,

on the inner cylinder 7.

The stop valve rod 36, by reason of the backward movement of the washer 22, will be moved tothe right of the position seen inFig. 2, whereupon the stop valve will be moved lfrom the position seen in Fig.'2, whereby the ports 62 and 63 are thrown into communlcation by reason of the connecting neck 34 of said stop valve,

andvpressure can freely pass through the 62, 63, 64 and 65 to the large lng valve, which will now be forced forwardly into the position seen in Fig. 1, thereby opening the ports 8 will be forced backwardlybr tothe' right of the position seen in Fig. 2, which operatlon can be continued at leasure so long as the stop valve occupies t e osition seen in Fig. 6. At the same time t at the distributing valve is forced forwardly or into the position seen in Fig. 1 and the ports 66, 67 and 68 are open for the admission of live pressure into the front lend of the cylinder, and the orts 66X and 67 will be open for the ex aust 66, 67 and 68 and the hammer i .p broad princip e of my invention, the same'l button set is released from the rivet the ail" pressure through the port 37, will force the stop valve, st'op valve' rod and Washer for wardly into the position seen in Fig. 2, said` Washer being now in contact with the button 4set bushingand the hammer '8- W'ill sto working even if vor while the pressure is a( mitted to the distributing valve 10; It will be ap arent that in carrying out the will be applicable to other forms of pneumatic tools, Which'are used for other purposes than riveting, and I also' desire it to be understood that any other suitable form of impact device other than thebutton set 24.

may be employed withoutdeparting from the spirit of my invention.l Especial er'n-.

phasis is also laid upon the feature of moving the tool proper by air pressure against thev work anc from the work according to requirements without Startingthe operatlon of the hammer or piston, even alt rough live fluid pressure is .acting upon the distributing valve or .saidhammen It will be obvious also that slightclianges may be made in the form of the stop valve 3l, whereby the de,-

sired result may be effecteihand that otherl or equivalent means may be em iloydfor actuating the stop valve forward Y or'backf. i

-necte.d; wrtli said cylinder for controlling the admission-of motive fluid, .a' passage coni wardly than that vshown which will come within thescope of my invention., as'forexample, a spring may be employed in the place of the lluid pressure which enters the recess 32 through the port 37.

lt will be apparent that lurtlier'chlanges mayy be made by-those skilled in the artv which will' come withiri'the scopeof my invention, and` I- do not therefore desire to be limited in every instance to the exact con'.

' structionfherein shown and described.

, above'referred te, since before the hammer` It will be evidentI that the pneumatic tool' embodying Y.the valve, hammer and co-acting ports in my presentl inventiont contains the same advantages which exist in the tool protected inmy prior patent No. 647,415, herein strikes the impact device or-shank27 ofthe ,buttonl set, the valve 10 will 'move in the y same direction and when the "blow ,of the. hammer is delivered the valve is on the lefthand side, the blow instead olf rebounding the valve from its scat tendingto hold said valve more 'firmly seated; since Ithe momentum or slight forward movement imparted to the' -tool when. said. blow is struck, iii'ust simulraucously impart a slight forward movement to the valve since the latter and said hammer ie operation of the tool will continue as ing at the end, and a stop valve acti tools now in use, as the same is reduced to a minimum.. i

In Figs. 5 to 8, I have shown sectional and' i erspective views of the throttle valve and its ad'nncts employed, wherefrom it will be seen t at the throttle valve is provided with -a.flattened side 78, ythrough which communication is' had with the longi'tulinally-extemling main 4exhaust port 48, it being apparent that the solid ortiro'iis or heads 79 and 80 are connected y the neck 81, whereby the cove 39 is formed, said solid portion78 be ing flattened on its surface opposite the lat` tenedportion 78 as indicated at 82, Wherefrom it.will` be seen that the operation` as above described with respect to the throttle V valve can be readily effected'.

Having thus described my invention, what If claim as new, and desire to secure by Letters Patent, is

1.v In apneumatic tool, the combination" of the inner tool cylinder, the casin and the.v outer tool cylinderbhaving a shou qer, of a istpn movable in the inner cylinder, ahol-l ,ow distributing valve., thefinterior surface ofwhich is open toflnidpressure upini o n- ,ing the throttle valve, said valvemovab 'e in the same Vdirection as the piston but indey pendently thereof, ports 'controlled bysaid "valve, a pressure chamber atathe rear of the inner '.tool cylinder, `a throttlev valve `controlled 'by saidthrottle valve through the casingy for the motive fluid to exert pressure` against 'said shoulder, a removable end for ioo ios

said casing having a'port therein controlled by said throttle valve, opening into the cas in con-l aust ports in communication with said pressure chamber h and controlled b the throttle valve, a pressure area in sai pres,-

l'sure chamber greater y than tliat of said shoulder, g said stop valve movable parallel'.

with the distributing valve andlcontrolli port-s common to' Abot-h of said valves, an

operated in one direction mechanically and in the opposite direction by Huid pressure.

2. In a pneumatic tool, the combination of the inner tool cylinder, the cre' ,andthe outer tool cylinder having a'shu der, of a 'iston' movable in the inner .cylinder-,a hol;

. ow distributing valve, the interior surfaceof which isopen; to fluid pressure 'upon o `en.- ingthe tl'irilittle val-ve,-said valve movab e in iie samedirection as' the piston but indevpend'ently thereof, ports control-led by said iio . unctioiiwvith' said 4distribu'tii'ig va ve, ex-

ria

vmeans whereby 'saidstop valve is p'OSitively the thrott e'valve, sai

valve, a pressure chamber at the rear of the inner tool cylinder, a\throttle valve parallel with said cylinder for controlling theadmission of motive fluid, a passa e controlled by said throttle valve through t e casing for the motive fluid to exert a'pressure against said shoulder, and a stop valve acting in conjunction with said distributin valve, exhaust orts in communication Wit said pressure chamber and controlled by the throttle valve, a pressure area in said pressure chamber greater than that of said shoulder, said stop valve movable parallel with theA distributing valveand controlling. ports common -to both of said valves, and means whereby said stop valve is positively operated in one directlon mechanically and in the opposite direction by fluid pressure.

3. ln a pneumatic tool, the combination 'of the inner tool cylinder, the casin and the outer tool cylinder having a shou der, oi a piston movable in the inner cylinder, a holow distributing valve the interior surface of which is o en to fluid ressure upon opening d) valve movable in the same direction as the piston but independently thereof, ports controlled by'said valve,

a pressure chamber at the rear of the inner Y tool cylinder, a throttle valve for controlling the admission of motive fluid, a passage controlled vby said throttle valve through the casing for/the motive iuid to exert a pres- .j

sure against said shoulder, and a stop valve acting in conjunction with said distrlbuti valve, exhaust ports in communication Wit said pressure chamber and controlled by the throttle lvalve, a ypressure area in said pressure chamber greater than that of said shoulder, said stopfvalve movable parallel with the distributing valve and controllinfr' ports common to both of said/"valves, an y means whereby said stop valve is positively operated in one direction mechamcally and JULUS KELLER.

l Witnesses:

JOHN A. WiEDERsHEIM, C. D.MCVAY. 

